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arXiv 0705.1227cs.ITcs.NImath.IT
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主频谱用户干扰下的认知无线电速率自适应

Rate Adaptation for Cognitive Radio under Interference from Primary Spectrum User

Petar Popovski, Hiroyuki Yomo, Kentaro Nishimori, Rocco Di Taranto

摘要:

认知无线电可以作为给定频谱中的辅助系统操作。该操作应当使用有限的功率,以便不干扰主频谱用户的通信。在这样的条件下,本文研究了如何最大化次级系统的频谱效率。次接收机分别观测两个用户(次发射机和主发射机)的多址信道。我们表明,对于频谱效率的操作,二次系统应采用并行干扰消除(OIC)。利用OIC,当主速率和从主系统接收的功率产生这样的机会时,次系统解码主信号。对于这样的操作,我们推导出次级系统中可实现的数据率。当主信号可解码时,我们设计了一种基于叠加编码的方法,通过该方法,次系统可以获得最大可能的速率。最后,我们研究了当使用多个信道时,次系统中的功率分配。我们发现,最佳的功率分配与OIC可以实现通过拦截注水,而不是传统的注水。结果表明,通过机会干扰消除实现的速率的显着增益。

英文摘要:

A cognitive radio can operate as a secondary system in a given spectrum. This operation should use limited power in order not to disturb the communication by primary spectrum user. Under such conditions, in this paper we investigate how to maximize the spectral efficiency in the secondary system. A secondary receiver observes a multiple access channel of two users, the secondary and the primary transmitter, respectively. We show that, for spectrally-efficient operation, the secondary system should apply Opportunistic Interference Cancellation (OIC). With OIC, the secondary system decodes the primary signal when such an opportunity is created by the primary rate and the power received from the primary system. For such an operation, we derive the achievable data rate in the secondary system. When the primary signal is decodable, we devise a method, based on superposition coding, by which the secondary system can achieve the maximal possible rate. Finally, we investigate the power allocation in the secondary system when multiple channels are used. We show that the optimal power allocation with OIC can be achieved through intercepted water-filling instead of the conventional water-filling. The results show a significant gain for the rate achieved through an opportunistic interference cancellation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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